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From: Simon Peter <dn.tlp@gmx.net>
Subject: Bug#306261: pppd does not properly close /dev/ppp on persist
When using the kernel PPPoE driver, pppd never
closes /dev/ppp when the link has come down.
It opens superfluous fds to the device each time it re-opens the
connection, with the unclosed ones falsely reported always ready for
data by select().
This makes pppd eat up 100% CPU time after the first persist because of
the always instantly returning select() on the unclosed fds.
The problem also occurs with the upstream version, but does not occur
when a pty/tty device is used for the ppp connection.
diff -u -r ppp-2.4.3/pppd/sys-linux.c ppp-2.4.3/pppd/sys-linux.c
--- ppp-2.4.3/pppd/sys-linux.c 2005-04-29 20:08:37.000000000 +0200
+++ ppp-2.4.3/pppd/sys-linux.c 2005-04-29 20:07:03.000000000 +0200
@@ -455,6 +455,13 @@
if (new_style_driver) {
int flags;
+ /* if a ppp_fd is already open, close it first */
+ if(ppp_fd > 0) {
+ close(ppp_fd);
+ remove_fd(ppp_fd);
+ ppp_fd = -1;
+ }
+
/* Open an instance of /dev/ppp and connect the channel to it */
if (ioctl(fd, PPPIOCGCHAN, &chindex) == -1) {
error("Couldn't get channel number: %m");
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